WASHINGTON, April 25 -- A group of 17 state Attorneys General submitted a public comment letter to the Pipeline and Hazardous Materials Safety Administration within the U.S. Department of Transportation regarding Exxon Mobil's preemption application. The letter serves as a rebuttal to comments made by the New York Attorney General and advocates for firm enforcement of the Hazardous Materials Transportation Act's (HMTA) express preemption provision in order to maintain national uniformity in haza  more